Fixes 3039: C++ STL was having data race issues with instantiating the debug_commands and the vector that was supposed to reference them. Seems like :v: ran into this issue a few times before...

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10712 387891d4-d844-0410-90c0-e4c51a9137d3